<template>
	<view>
		<my-search @click="goToSearch" bgcolor="#07c160" :radius="20"></my-search>
		<view class="scroll-view-container">
		  <!-- 左侧的滚动视图区域 -->
		  <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
			<view @click="changeActive(index)" v-for="(item, index) in cateList" :key="item.cat_id" :class="['left-scroll-view-item', index === active ? 'active' : '']">{{item.cat_name}}</view>
		  </scroll-view>
		  <!-- 右侧的滚动视图区域 -->
		  <scroll-view :scroll-top="scrollTop" class="right-scroll-view" scroll-y :style="{height: wh + 'px'}">
			  <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
			    <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
				<view class="cate-lv3-list">
				      <!-- 三级分类 Item 项 -->
				      <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="goToGoodsDetail(item3)">
				        <!-- 图片 -->
				        <image :src="item3.cat_icon"></image>
				        <!-- 文本 -->
				        <text>{{item3.cat_name}}</text>
				      </view>
				    </view>
			  </view>
		  </scroll-view>
		</view>
	</view>
</template>

<script>
	import tabbarBadge from '../../mixins/tabbar-badge'
	export default {
		mixins: [tabbarBadge],
		data() {
			return {
				wh: 0,
				cateList: [],
				active: 0,
				cateLevel2: [],
				scrollTop: 0
			}
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const {data:res} = await uni.$http.get('/api/public/v1/categories');
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			changeActive(idx) {
				this.active = idx
				this.cateLevel2 = this.cateList[idx].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			goToGoodsDetail(item) {
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?cid=' + item.cat_id
				})
			},
			goToSearch(e) {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
